A father who called 911 to get medical help for his 25-year-old son instead is trying to make sense of how police killed him.

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An officer used a stun gun on the son, which did not have much of an effect, and he then began slashing at officers with a knife, KHSL-TV reported.

The father said his son needed medication. Chico police said they tried to defuse the situation but the son also tried to stab his father, the Chico Enterprise-Record reported. Police fatally shot the man Friday.